PDG
PDG
PDG(Procedural Dependency Graph)
TOPS(Task Operators)
PDG is designed to:
?Describe complex dependencies visually with nodes
?Transform that dependency description into a set of actionable, monitorable tasks
?Distribute those tasks with the help of a scheduler and compute them in parallel
為什么設(shè)計(jì)PDG:
- 直觀的描述依賴關(guān)系
- 將該依賴關(guān)系描述轉(zhuǎn)換為一組可操作的,可監(jiān)視的任務(wù)
- 在調(diào)度程序的幫助下分發(fā)這些任務(wù)并并行計(jì)算它們
PDG=所有的任務(wù)及其中蘊(yùn)含的依賴關(guān)系。是高于OBJ、ROP、SHOP、CHOP等層面的,由此誕生了一個(gè)嶄新的模塊——TOP(Task OP)。PDG是一個(gè)獨(dú)立的API接口,而TOP是類比傳統(tǒng)SOP、DOP等模塊的一套節(jié)點(diǎn)系統(tǒng)。Houdini 17.5包含所有的PDG和TOP。
TOPS
A TOP network describes a “recipe” for generating work items for the computer to do, and efficiently runs them in processes on a single machine, or on a render farm, figuring out dependencies so it can run as many items in parallel as possible. The generated “recipe” is an underlying PDG (Procedural Dependency Graph) describing the work items to do and their dependencies.
TOP網(wǎng)絡(luò)描述了一個(gè)“recipe”,用于生成計(jì)算機(jī)要執(zhí)行的工作項(xiàng),并在單個(gè)計(jì)算機(jī)或渲染服務(wù)器場(chǎng)中的進(jìn)程中有效地運(yùn)行它們,計(jì)算出依賴關(guān)系,以便它可以盡可能多地并行運(yùn)行項(xiàng)目。 生成的“recipe”是底層PDG(程序依賴關(guān)系圖),描述要執(zhí)行的工作項(xiàng)及其依賴關(guān)系。
參考
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